<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    *{
      padding: 0;
      margin: 0;
      box-sizing: border-box;
    }
    body,html{
      width: 100vw;
      height: 100vh;
    }
    .container{
      --bg:url('./firefox.png') no-repeat center/cover;
      background: var(--bg);
      height: 90vh;
      /* box-shadow: 10px 10px 10px red; */
      filter: drop-shadow(10px 10px 10px red);
    }
  </style>
</head>
<body>
  <div class="container"></div>
</body>
</html>